because there test_grammar.py pulls them out of strings there.
# putting them in test_grammar.py has no effect:
warnings.filterwarnings("ignore", "hex/oct constants", FutureWarning,
".*test.test_grammar$")
+if sys.maxint > 0x7fffffff:
+ # Also suppress them in <string>, because for 64-bit platforms,
+ # that's where test_grammar.py hides them.
+ warnings.filterwarnings("ignore", "hex/oct constants", FutureWarning,
+ "<string>")
from test import test_support